The EstLink 2 subsea power cable between Finland and Estonia has been repaired and is expected to return to commercial operation on Wednesday, according to national power grid operator Fingrid.
The cable broke due to a technical fault in January, and has been offline since then.
The break in transmission service led to higher prices in Estonia, and in turn reduced the electricity spot prices in Finland as producers were unable to sell power on the Estonian market.
Fingrid said the repair work, which was performed in cooperation with Estonia grid operator Elering and the cable's manufacturer, had progressed as planned.
The failure site of the cable, on the Estonian coast, posed challenges to the repair effort, the Finnish grid operator said. The damaged part of the line was replaced with more than 300 metres of new cable.
In a press release on Tuesday Fingrid's unit chief, Kimmo Nepola, said that the repair effort was led by Elering and went very well, despite its complexity.
"The repair was carried out on a temporary 400-square-metre repair platform built on a dry seabed. This innovative solution allowed us to ensure the repair schedule and to save spare cable," Nepola said.
According to Fingrid, the line's failure reduced electricity transmission between the two countries by around 650 megawatts, but did not affect the functionality of Finland's electricity system more broadly.
The Estlink 2 cable is one of several electricity transmission links between Finland and Estonia. The cable is about 170 kilometres long, with about 145 kilometres of it running along the seabed.
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